FDA Rebuffs Insulin Drug

By

Clemens Bomsdorf

Updated Feb. 11, 2013 10:01 p.m. ET

COPENHAGEN—U.S. regulators told the world's biggest maker of insulin that they couldn't approve a potential blockbuster diabetes drug, delaying its U.S. introduction and sending the company's shares tumbling.

The Food and Drug Administration notified Denmark's Novo Nordisk A/S that it needed to conduct additional clinical testing on the...